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- Calculating drainage area is a way of estimating the amount of storm water runoff that a pipe or a channel can handle. One method is the Rational Method, which uses the equation Q = C x I x A, where Q is the runoff, C is the coefficient of runoff, I is the rainfall intensity, and A is the area of the drainage zone1. Another method is to use a calculator that computes the area that can be drained by a pipe of a given size and grade, based on whether the pipe has a smooth or rough interior2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.For drainage areas greater than 200 acres, other methods can be used, or the drainage area can be divided into zones less than 200 acres. The Rational Method equation is: Q = C x I x A where: = Storm Water Runoff (in cubic feet per second) = Coefficient of Runoff = Rainfall Intensity (in inches per hour) = Area of Drainage Zone (in acres)www.ndspro.com/static/version1537272418/fronten…Calculate area drained Area Drained (Acres) Use this calculator to compute the area that can be drained by a pipe of a given size and grade. Smooth Interior Pipe? Yes No Pipe Diameter (inches): % Grade: * * %Grade is the feet of fall per 100 feet of length.apps.extension.umn.edu/agriculture/water/planning…
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